JAMES KING-HOLMES / SCIENCE PHOTO LIBRARY JAMES KING-HOLMES / SCIENCE PHOTO LIBRARY
Terahertz dental imager. Male technician aligning a tooth for terahertz pulse imaging (TPI). This new type of imaging is safer than X-rays and gives extra diagnostic information. Three-dimensional images can be created by scanning with a pulsed terahertz (THz) wave, the delay in its passage through the tooth showing internal surfaces. The tooth's composition may be determined as each tissue or area of decay absorbs different parts of a THz wave. THz waves lie between infrared and microwaves in the electromagnetic spectrum. TPI can also be used for inspecting microchips and food, or for detecting hidden objects. Photograph- ed at Toshiba Research Europe, Cambridge, England.
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